The house points hour-glasses

[Annette]

No: HPFGUIDX 110992

 The points awarded to Griffindor and Ravenclaw are represented by 
rubies and sapphires. ( OOTP, UK hardback p. 751)My guess is that he 
Slytherin hourglass contains emeralds but what precious stones do 
Hufflepuffs collect? They should be yellow or black, in keeping with 
the house colours, any guesses?

I'm new to the wonderful world of Potterania, please feel free to 
snort at my ignorance or maybe, be so kind as to pander to my 
thoughts.

Thanx , Nettie